Rose slug sawfly

Systematic position: the rose slug sawfly (Eriocampoides rosae) belongs to the order Hymenoptera and the family Tenthredinidae. It is a well-known garden pest that specifically targets rose plants in temperate regions worldwide.

Host plants: the primary hosts are plants within the Rosa genus. Both domestic garden roses and wild briars are susceptible to infestation, often causing severe aesthetic and physiological damage to plants in residential gardens and commercial nurseries.

Biology and life cycle: adult sawflies emerge in late spring or early summer. Females use their saw-like ovipositors to insert eggs into the leaf tissue. Upon hatching, the larvae, which resemble small, slimy slugs, begin feeding on the underside of the leaves. They mature through several instars before dropping to the ground to pupate in the soil.

Damage and pest impact: the larvae feed by skeletonizing the leaf blades, consuming everything except the veins. This feeding pattern creates a characteristic lace-like appearance. Severe infestations lead to premature leaf drop, which significantly weakens the rose bush, reduces its vigor, and suppresses blooming in the current and following seasons.

Control measures:

• Hand-picking larvae from the leaves when the infestation is small.
• Tilling the soil beneath the plants in autumn or early spring to disrupt the pupation cycle.
• Applying insecticidal soap or horticultural oils for organic control.
• Using systemic or contact insecticides during the larval stage if population levels are high.
• Ensuring healthy plant growth to improve the rose's resilience against pest attacks.